Paper is being dried with recirculating air in a two-stage drying system at 1 atm. Air (State 1) enters the first dryer at 180°F, where it is adiabatically saturated to 100% relative humidity (State 2). The saturated air is then reheated to 174°F (State 3) before entering the second dryer, where it is adiabatically humidified to 80% relative humidity (State 4). This air stream is then cooled to 60°F, causing some moisture to be condensed (State 5). This is followed by a third heater to heat the air to 180°F (State 1) before it returns to the first dryer, completing the entire cycle. 1. Draw the process on the humidity chart. Label all 100% RH DRYER 1 TDB 180F relevant points consistent with the diagram of the process provided. TDB = 174F HEATER 1 DRYER 2 2 1 2. For each stream, determine the moisture content in air (lb H20/lb dry air). 80% RH 5 HEATER 2 CHILLER TDB = 60F 3. Determine the lb H2O evaporated (moisture leaving the paper and entering the air) in each dryer per lb of dry air being circulated. 4. Determine the lb H2O condensed in the chiller per lb of dry air circulated.
Paper is being dried with recirculating air in a two-stage drying system at 1 atm. Air (State 1) enters the first dryer at 180°F, where it is adiabatically saturated to 100% relative humidity (State 2). The saturated air is then reheated to 174°F (State 3) before entering the second dryer, where it is adiabatically humidified to 80% relative humidity (State 4). This air stream is then cooled to 60°F, causing some moisture to be condensed (State 5). This is followed by a third heater to heat the air to 180°F (State 1) before it returns to the first dryer, completing the entire cycle. 1. Draw the process on the humidity chart. Label all 100% RH DRYER 1 TDB 180F relevant points consistent with the diagram of the process provided. TDB = 174F HEATER 1 DRYER 2 2 1 2. For each stream, determine the moisture content in air (lb H20/lb dry air). 80% RH 5 HEATER 2 CHILLER TDB = 60F 3. Determine the lb H2O evaporated (moisture leaving the paper and entering the air) in each dryer per lb of dry air being circulated. 4. Determine the lb H2O condensed in the chiller per lb of dry air circulated.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Paper is being dried with recirculating air in a two-stage
drying system at 1 atm. Air (State 1) enters the first
dryer at 180°F, where it is adiabatically saturated to
100% relative humidity (State 2). The saturated air is
then reheated to 174°F (State 3) before entering the
second dryer, where it is adiabatically humidified to 80%
relative humidity (State 4). This air stream is then cooled
to 60°F, causing some moisture to be condensed (State
5). This is followed by a third heater to heat the air to
180°F (State 1) before it returns to the first dryer,
completing the entire cycle.
1. Draw the process on the humidity chart. Label all
relevant points consistent with the diagram of the process provided.
2. For each stream, determine the moisture content in air (Ib H20/lb dry air).
3. Determine the lb H20 evaporated (moisture leaving the paper and entering the air) in each dryer per lb of dry air being
100% RH
TDB = 174F
HEATER 1
DRYER 2
DRYER 1
80% RH
5
HEATER 2
CHILLER
TDB = 180F
TDB = 60F
circulated.
4. Determine the lb H20 condensed in the chiller per Ib of dry air circulated.
(2)
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